Perform the following calculations. Express the answers with the correct number of significant figures.a) 7 g - 3.5 g - 2.75 g =

b) 200.00 kg - 199.0 kg =

c) 25 L - 3.0 L =

d) 0.67 cm + 2.0 cm + 0.090 cm =

e) 104.5 g + 0.40 g =

Answers

Answer 1

Answer:

The answer will be 0.75 gram, 1 kilo-gram, 22 L, 2.76 cm, and 104.9 gram.

What is gram?

A metric unit with mass and weight equal to approximately 15.432 grains, or one-thousandth of a kilo-gram, is called a gram.

Calculation of given question.

a) 7 gram - 3.5 gram - 2.75 gram = 0.75 gram

b) 200.00 kg - 199.0 kg = 1 kilo-gram

c) 25 L - 3.0 L = 22 L

d) 0.67 cm + 2.0 cm + 0.090 cm = 2.76 cm

e) 104.5 g + 0.40 g = 104.9 gram

To know more about gram

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Answer 2

Answer: Since there are no conversions to be done just add them as is
a) 1 g
b) 1.0 kg
c) 22 L
d) 3.6 cm
e) 104.9 g

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Which of these statements is true? A.
Some molecules may contain no atoms.

B.
Some elements found in nature exist as molecules.

C.
Some compounds include only one type of element.

D.
Some atoms are made of two or more different elements. Which of these statements is true?

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Some elements found in nature exist as molecules.

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Some compounds include only one type of element.

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Some atoms are made of two or more different elements.

Answers

Pretty sure it's B. If not, then it's C.

Which statement about a system at equilibrium is true?(1) The forward reaction rate is less than the reverse reaction rate.(2) The forward reaction rate is greater than the reverse reaction rate.(3) The forward reaction rate is equal to the reverse reaction rate.(4) The forward reaction rate stops and the reverse reaction rate continues.

Answers

Answer: Option (3) is the correct answer.

Explanation:

A reaction in which the concentration of reactants equal to the concentration of products is known as an equilibrium reaction.

For example, $Ca(OH)_(2)(s) + H_(2)O(l) \rightleftharpoons Ca^(2+)(aq) + 2OH^(-)(aq)$

Therefore, we can also say that in an equilibrium reaction rate of forward reaction becomes equal to the backward reaction.

The true statement about a system at equilibrium is that the forward reaction rate is equal to the reverse reaction rate.

What is equilibrium state?

Equilibrium state is that state in which the concentration of reactant as well as of producrs are constant. i.e. not changes.

Equilibrium state of any reaction will be represented by the double headed arrow as:

A + B ⇄ C + D

Given reaction defines that rate of forward reaction is equal to the rate of the backward reaction.

Hence option (3) is correct.

To know more about equilibrium state, visit he below link:

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What is the electron structure of nitrogen?1s22s22p3
1s22s23s22p1
1s32s32p1
1s12s12p5

Answers

Answer : The correct option is, $1s^22s^22p3$

Explanation :

Electronic configuration : It is defined as the arrangement of the electrons of an atom in an atomic orbital.

The given element is, nitrogen.

The nitrogen element belongs to group 15 and the atomic number of nitrogen is 7.

As we know that the number of electrons is equal to the number of atomic number.

The number of electrons present in nitrogen = 7

Thus, the electronic configuration of nitrogen is, $1s^22s^22p3$

1s22s22p3 considering N is the third element in the 2nd P sublevel

A + B → C Select the rate law for the reaction above using the following information: Holding the concentration of A constant and doubling the concentration of B results in the rate of the reaction increasing from 1.5E-3 M/s to 1.2E-2 M/s. Keeping the concentration of B constant and doubling A results in the rate of the reaction increasing from 1.5E-3 M/s to 3.0E-3 M/s.

Answers

For the initial conditions:
1.5E-3 = k A^n B^m

For the second condition:
1.2E-2 = k A^n (2B)^m
1.2E-2 = 2^m k A^n B^m
From the initial condition:
1.2E-2 = 2^m (1.5E-3)
m = 3.32

For the third condition:
3.0E-3 = k (2A)^n B^m
3.0E-3 = 2^n k A^n B^m
3.0E-3 = 2^n (1.5E-3)
n = 1

Therefore, the rate law is:
r = k A B^3.32

When determining an element identity what is the most important Subatomic part to look at?

Answers

Answer: Protons

Explanation: When determining an element identity the most important Subatomic part to look at is the number of protons in the nucleus determines the identity of an atom .

A 125 mL aqueous solution contains 1.86 mc032-1.jpg 10–5 g of potassium chloride and has a density of 1.02 g/mL. What is the concentration in ppm?

Answers

mass of the solvent (H2O) in kg

D = m / V

1.02 = m / 125

m = 1.02 x 125

m = 127.5 g of H2O

127.5 / 1000 => 0.1275 kg

mass of solute in mg:

1000 x ( 1.86 x 10⁻⁵ ) = 0.0186 mg

ppm = mass of solute in mg / mass of solvent in kg

ppm = 0.0186 / 0.1275

= 0.1458 ppm

hope this helps!

Answer:

Explanation:

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